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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9dced289f21cec0d7e43ad27499fe7d915b2b36479ed896c62874a33c44ae57' 
  AND token = 'E4POMADFMsUEsiknLq90J5s4r6Dvh1JbANOn5hUFPak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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