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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0193d99f5d1ef949d26bf27540a351a92ceef6e01f4e6499792a0aa97cb5743' 
  AND token = 'batzVZ7DG9xJLRNHr0wAg/lWUa1jGF/ZOQTcCoxmcMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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