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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14694aedce2d5ea83e2cf37407c78dba0eb9967f30ebad8f4b0163062c2f365' 
  AND token = 'XWX/XA4sbsj1+yIs1kz80+aFQDdvkez+NO1iY+Af3ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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