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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594ca5a3097b165071a3fdf1bea3084d5400137795f4d976ec1fe2357bdb5765' 
  AND token = 'I8wLiLZ3A38ql00TY2J/Cqi8SGbR+pJAAosiYs+P0H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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