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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31aa74559dad39132edb64dfe4d9d338b0951e6245c462decee39711b0d6a083' 
  AND token = '0gfovT9xOfm+mSIGz+S/BHx0tiIh7HZjIBx/o7yuoVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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