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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4554fc8c6731a13c1d4519e2b80de1e57b23bf0b341d84cc0805b0e83d321e73' 
  AND token = 'MqmlTTypsUANGNrPGOefEUqaFQA3Zht4Eh9GtxBpdyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00707

JSON explain

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