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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08863fc76d7edba1489f6b765ad83bb9b374f1538ff755af0dd6e392384c02a6' 
  AND token = 'wyeERLbITYj1k8dbmX7HlEp2rgyX+WoNmO4P5AuBttI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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