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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db863de9f02a98b9e7be25db4ff36d7e69370a956f5bc25ffe357f4f459abb7f' 
  AND token = '2w+VQMtOqROV3nN2E+UYdXZ88PRzvZarrpL8+j0i72E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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