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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82871c6c776309ee7a2775c7b712e6f8bf32e216095d249e7c9688bbbd50f04' 
  AND token = 'w8jkqenTeOUVxQjunByRPdV9W5NTmo2x4wPTcq3fVDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}