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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68eff7bab142f951b3afd74934c4568342bd1d7f96125f14efdf46c8eb04d362' 
  AND token = '6QHh1Hoo4w+cm6NsL1MBHBR+uo4Im8SJcSV3k91expI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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