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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d281f4765ca029051eb7779fb9abffc7172139141d1ea4d68cb70fc7f40ae1' 
  AND token = 'qnQJ2E6/zVul4QLEHwRsAs+yEDh9fL2ysSU9yh85y44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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