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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae8edd6e82ca9b760a04b0c9fc1811e0c2fbc7352e13f456ccaa3beb99303ce' 
  AND token = 'ODsyYmCnXVFsCrgQbXe3Ubjl2DvMsZ3Um9agX468aKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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