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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56d4b53b648812e1ce1be86cbdcfb642f0792d395c5e5f6975aceaeb2c0fe59' 
  AND token = 'noRdDoy0CtOHzajB8hgl1C/95hJi4x4Bz8AheuJEv6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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