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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c807957beb14c1c85a9bac6a62f6cd73848ebbbbb516b5b386d958712f3fb9a' 
  AND token = 'yK1H5E2wN/QnHpniwBUoKQLxt+j15JE+vf3Ue2QQDmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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