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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fe944f4142b8c81d01bfbb52b9894ebaa4b907c2a426039e1e7179ef9a0dd6' 
  AND token = 'JnN2h/asez1+QHszNvOg1yDME5wRBObEs4JSnjm/6hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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