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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2057c86535918122cc0db755f43b2590d21fbd9acdf67fce68b955eee6560455' 
  AND token = '6HUc3ItSUSvspW2DMuqSdNSlUPLmlEy3S3smZgQeqIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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