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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f7545ebc652a39d48793fa1c3a576e06a70451da350290899d0892a4b14f10' 
  AND token = 'C3mGqrp23OXdVXuMA6hOYW1r5y+l/A5R0ndqU4EWQQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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