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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c9a17fe23b7bccb5f2098e5d79e10dfee1b5b9d744e7639c775cfe0e512f7a' 
  AND token = 'MXHfgR3fWm1CWqSbZrgYzC6Z+gJIltgClBFCRbHMwhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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