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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdec14e7fb260377f5fa3f64ecead2a0d77f339c3fc0e9910598ddc6bf696aa1' 
  AND token = '7yXAYtNqb5Yl/My+dXYV4nFz4FsLuyWM6U+jbElTOCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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