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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54bd58ec2b4c1c308d1d5a281e5a200353cfef909a3902c015ace3bcc033fd68' 
  AND token = 'xDTr9XfuVQ8/Ae2LRKjTM70d6rpV7nJvUj+VpXGLR7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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