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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f305e99504ac343aa26789099aab736520637b9d3988ec5d2a1d743148910424' 
  AND token = '0Bho+3dK6CFkvnAqwvpHPgyy9knqMRihKdx0i/n/0dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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