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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84dc2e2060dd28dc04579b14c392724500049fef2ee02e4f15db46cfee800e76' 
  AND token = 'HUFLTdRMOa8v5DDMPkqR4s0W3uf8jLHmK0NiLpC1CBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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