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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaebc0d32870ace168fd64b4a318d451adcc532ecd85d5de6d6e51cfbbbb626b' 
  AND token = 'hduztwRoWsMS0RanCZe6Fedx2Nm16vdoSBo+/ZcQ5T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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