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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6371e435652a22f71bd3b0d36d90716e2f350eecd6af7ccd3eb45fa9b60fd50' 
  AND token = 'PT8X2q0VYRRqy7eom4BSUQWl+P2dXNZ9D0oy0Q5/wlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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