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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e8e0c3a98d61701856bb28ac703ea452eb40c88bad1cb6ff9b95c1bcf27486' 
  AND token = 'WvTbToLpstw4JKaeU5YNwLdwGG4+mBMAENK0SJVO+74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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