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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea03c2736d0182816bab880fa1d3458f57238498a08db286ba45116a3b00157' 
  AND token = '8cKGLsGsHVNjfOoTdTOF1nFRx4LlEGNNWDCC5ahnUjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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