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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2f32fe386cd77b3a24ee37ccbbcdece3602419ceebe9ef12c5146550b4a44d' 
  AND token = 'MvhMs93JA08rBINVWaaB2nkz3Ucai0IMj+gXNdXkXbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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