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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94757a4ed1f620c65d1c220ba0c81e93e246154417a06ca6655fc937c60a5746' 
  AND token = 's0RylPAUVpa2aPKGQW9AwgIR6PLo1lXmzJQ36+Os/ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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