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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68925f596fca62ba6936143c9b33e225cc4180e4c5a417d16d42954d5646d7c3' 
  AND token = '5mjB1Ect+svsykt+HyMY0gNvdqG5mCUqNUqDF0xSCZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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