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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2be7a15fea4cf3523119015da3884f50eb038ac68473b18d3f6a9f2f3ad733e' 
  AND token = 'zeA2lEAZuUZMlYA28YHUbXBSY7YjD427rhu3DAHWXGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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