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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1e21af507ffe354bcf11461d03ff8c7e07a2027c810164bdac1ca01296e27d' 
  AND token = 'Qtjp/44yDGGmajTQKbyYn3v7ptY0/4T/kd1oNPex5io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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