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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901d54b1c9908b5ca387f327a61d4fdf33b8c683e95598f18be8e326bf97aa32' 
  AND token = 'qm21xzIrb6Ff3mDeKS1r7ogqU+6UiqvDpinCOvoKm2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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