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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db4edad9fbda0dac6ff5e5f3f5c996768bc3bc8749f316ec22ffff51e57ad53' 
  AND token = 'evI2tvbUlEUgraMb872lPC2X/ylYdxfyEoPd4u8OhTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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