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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d0f99704a94aae040bcdb47497e7077c8876f74f3c86dc597731a88cca3b02' 
  AND token = 'ZyS1ZvHK1wR/kbs/ecx8noSEGP6TGPNszDPIeeKE0ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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