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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d62ec81dc0244e4500c15d2f72ffdc6a5165ab16d2c29e89894c370e1d6784' 
  AND token = 'ka4GkV+xujDEk1S2/WwStLy43mMXyNQviiV0Umb5Xt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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