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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bff0546a2a5d0d1631d6326ad69a2457c5e3e78e2a2c1bb7c4408c7623e95f' 
  AND token = 'xMD2MAOcieuIY05VHIg5kUktCczhazGfA92J/GkkHu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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