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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114f248e52407dd66421092fe85271e40c0644c0e5a8e27c0bf891b23e9fba00' 
  AND token = 'ApzZgvT/ASMkuruxmQ5CLr/d1Ct59YeeA+x2lExMszw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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