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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e42f12ac6011edcc9eef1ca99020e23cb6e32b41ef95b90b79a2b8fb748c25' 
  AND token = '7l3Km/246o4LyMv45wlRs2hrITRhpbtNayX9rN8KpRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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