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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0fc6f9f8b4029d91d6cbd5629101e5a9e1e5d7f12e4c984bad3c97100a5f59' 
  AND token = 'Zld8rGyisMuu36k/qaPkmluaki2SYzYP+EBnjz6h0fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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