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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee5293b5d8b1fd101dd9db6981268af6a02d7b82a8ebff9d661d99fbb1d49bd' 
  AND token = 's0PjqjZcfmTlldOImKD3Yvb/RlyYxXCZ+Ocznkc6enk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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