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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0b5844396412ba0d85d9406d565cb4364754d30fb0e99da7a21c0883fb9f64' 
  AND token = 'MXDewjem0xPe86JtQLmyB/5HeW8Y0HQfjbKH+vxtb1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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