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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65add6e6703fccdd225bfc36a824ca09d1e2fde44eaf6bf7732dc9eba72fe034' 
  AND token = 'lA16n62ZVXzihLILM23RDy20DIePk20Y9NRkWAqMdZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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