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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6242fb531e59138cd000ddac658a0141313ce98e8e8261c66f6e8de33a4e20' 
  AND token = 'WH2WgProhM110TzB1X4LMPpLStj7mnmn+YSycswe0NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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