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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229162941fcb15e121bdf7be81c4c0957e5ad7c005704248a1d753c386e68db6' 
  AND token = 'oCOvgNRuQMaIKXmQ7eYY8hc9qg3+DJdgz9eEO99Vm8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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