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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e283427918cc8cd106c3602c55f1d0464c48b3565f185ca367e47c06e0c9dd2' 
  AND token = 'a9r0ZQnhXd4Nd2Ioy0z1DArI7fXcy6hUi25+6j6vf4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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